You used to be able to get it with Doom 2, but for whatever reason you can't anymore, you have to buy the full collection. (I'd just wait until it's on sale because it'll probably be lower than the $10 you used to have to pay to get them with Doom 2.)

For the record, I was able to get the Master Levels with Doom 2 about two months ago. I already had Doom 2 (personal copy from long ago) so there was no need to install it, Steam gave me the option to download the Master Levels directly.

Was all good, copied and pasted the WADs to their own folder and now I can run them through Skulltag. Only obstacle for me was memorizing which level each master level WAD overwrote so I could idclev to it.

I can now confidently say that I own every Doom game ever. It will remain on my memory stick until the day I die.

You used to be able to get it with Doom 2, but for whatever reason you can't anymore, you have to buy the full collection. (I'd just wait until it's on sale because it'll probably be lower than the $10 you used to have to pay to get them with Doom 2.)

I bought DOOM 3 BFG before I knew that it was missing some levels and I wished there was a way I could buy this without having to rebuy all the dooms since I own most of them.

Doom 3 bfg edition is a god-damn scam. Essentially its doom 3 with updated graphics (could of easily been modded in) and a few extra maps, and doom 1 / 2 are censored, which not only causes problems with, well it being lame being censored, but since it is no longer the base wads, you cant use the plethora of existing mods for doom 1 and 2, since they aren't compatable with this new messed up and censored version.